Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Pensões ocupacionais de 7%, e um Crédito tributário de trabalho de 2%, e Outros benefícios de segurança social de 6% têm qual renda de investimento?
 ###Tabelas: CREATE TABLE 2005_indycar_series_schedule (2005_indycar_series_schedule_id AUTO_INCREMENT PRIMARY KEY, Rnd INT, Date VARCHAR, Race Name VARCHAR, Track VARCHAR, Location VARCHAR, Pole position VARCHAR, Fastest lap VARCHAR, Most Laps Led VARCHAR, Winner VARCHAR) CREATE TABLE fifth_round_proper (fifth_round_proper_id AUTO_INCREMENT PRIMARY KEY, Tie no VARCHAR, Home team VARCHAR, Score VARCHAR, Away team VARCHAR, Attendance VARCHAR) CREATE TABLE populations (populations_id AUTO_INCREMENT PRIMARY KEY, Country VARCHAR, Orphans as % of all Children INT, AIDS Orphans as % of Orphans INT, Total Orphans (Total) INT, Total Orphans (AIDS Related) VARCHAR, Maternal (Total) INT, Maternal (AIDS Related) VARCHAR, Paternal (Total) INT, Paternal (AIDS Related) VARCHAR, Double (Total) INT, Double (AIDS Related) VARCHAR) CREATE TABLE sources_of_income (sources_of_income_id AUTO_INCREMENT PRIMARY KEY, Region VARCHAR, Employment ( salaries & wages) VARCHAR, Self employed VARCHAR, Investment income VARCHAR, Working tax credit VARCHAR, State pensions VARCHAR, Occupational pensions VARCHAR, Disability benefits VARCHAR, Other social security benefits VARCHAR, Other income sources VARCHAR) CREATE TABLE recipients (recipients_id AUTO_INCREMENT PRIMARY KEY, Year INT, Title VARCHAR, Producer VARCHAR, Narrator VARCHAR, Author VARCHAR, Citation VARCHAR)  
SELECT Investment income FROM sources_of_income WHERE Occupational pensions = 7% AND Working tax credit = 2% AND Other social security benefits = 6%